Bug 2348601 (CVE-2025-21791) - CVE-2025-21791 kernel: vrf: use RCU protection in l3mdev_l3_out()
Summary: CVE-2025-21791 kernel: vrf: use RCU protection in l3mdev_l3_out()
Keywords:
Status: NEW
Alias: CVE-2025-21791
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-02-27 03:04 UTC by OSIDB Bzimport
Modified: 2025-03-31 15:16 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2025-02-27 03:04:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vrf: use RCU protection in l3mdev_l3_out()

l3mdev_l3_out() can be called without RCU being held:

raw_sendmsg()
 ip_push_pending_frames()
  ip_send_skb()
   ip_local_out()
    __ip_local_out()
     l3mdev_ip_out()

Add rcu_read_lock() / rcu_read_unlock() pair to avoid
a potential UAF.
Comment 1 Michal Findra 2025-02-27 20:20:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022609-CVE-2025-21791-6074@gregkh/T
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